Microstructure and mechanical properties of 316L stainless steel manufactured by multi-laser selective laser melting (SLM)

被引：10
作者：
Zhao, Lin [1 ,2 ]
Zhang, Jianfeng [1 ]
Yang, Jinlei [1 ]
Hou, Juan
Li, Jianjian [1 ]
Lin, Jun [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Thorium Energy, Shanghai 201800, Peoples R China
[2] Univ Shanghai Sci & Technol, Interdisciplinary Ctr Addit Mfg ICAM, Sch Mat & Chem, Shanghai 200093, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 913卷
基金：
上海市自然科学基金; 中国国家自然科学基金;
关键词：
Single laser forming zone; Dual laser overlap zone; Microstructure; Mechanical properties; Orowan strengthening; POWDER BED FUSION; PROCESS PARAMETERS; HIGH-STRENGTH; FABRICATION; DEFECTS; PARTS;
D O I：
10.1016/j.msea.2024.147053
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructure and mechanical properties of 316L stainless steel samples manufactured by dual-laser selective laser melting technology, were investigated in compare with that of the single-laser scanning samples. It was found that the porosity of the dual-laser overlap samples was lower than that of single laser forming samples due to the different laser energy density absorbed by the powders. Furthermore, it was found that the crystal structure and crystal orientation of both zones were similar. From the TEM observation, it was noted that the number density of nano-oxides in the overlap zone was higher than that in the single laser forming zone. This reason was suggested as the difference of the oxygen content inside the melt pool during the forming process. The strength and microhardness of the single-laser samples was lower than that of the dual-laser overlap samples, but the elongation was higher. By analyzing the strengthening mechanism, it was revealed that Orowan strengthening was the main reason for the difference. These results could guide the large-size component manufactured using the muti-laser selective laser melting technology.
引用
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页数：10
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